Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf3762d9e78a361…

MALICIOUS

PDF

68.2 KB Created: 2021-09-17 13:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46895029f1bae398e37c4ee4f535bd46 SHA-1: 6d153dd55d16b617ed282373503aa4d1cb1deb1a SHA-256: faf3762d9e78a3612dc41589b9ef593d030637d483368fd83e7e3d565149fc74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be used for hosting malicious files or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://teleinwestor.com/userfiles/file/gokinajun.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f45f32fd4---tuzubonobepovod.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/dunagudokinoganor.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/80898959846.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///54988377502.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/82519105236.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/nafazufa.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/71811046468.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xeriloka.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/dovulipowi.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zoril.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/41830624380.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/mozitopoje.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/daves.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/81858225068.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/15833318212.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/monerewog.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/petolisopuzoxunoz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa5f1bc33---96087006379.pdfIn PDF document text
    • http://rts-3.ru/upload/files/23982682229.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/89650730838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=catch+tiles+magic+pianoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 10752 bytes
SHA-256: f5b537432630d2d571fa582f60b5a70a644fa79e37e04de92d722a7b3a578a2d
font_01_sfnt_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 14980 bytes
SHA-256: 3a45fe249e658b87466608b820278dfadff24a08f577f09d1784234d430631cb
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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